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New alternator: 13.2 at B+, 14.1 at D+. Why? 200 1993

posted by  woodshavings on  Sun Mar 26 09:48 CST 2023
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last visit: Fri Oct 24 08:22 CST 2014
[RELATED]

As you may know from a previous thread, I installed a new Bosch reman alternator a few weeks back. I immediately noticed that the voltage was a 1/2 volt lower than the previous alternator but decided to give it a few miles to see if it solved itself. Nothing has changed, so checked a few voltages starting at the alternator and was very surprised.

These are the voltages at the alternator:

B+ to alternator case: 13.26V
D+ to alternator case: 14.11V

And the voltage across the battery terminals is 13.20V

The Bosch voltage regulator is rated at 14V. You can see it stamped on one of the pics here: 93 240 Alt Regulator

What may be causing this? Do I have a defective reman?

The battery warning light comes on when the ignition is turned to position 1, along with all the other dash warning lights. And no hint of the battery warning lamp being illuminating when the car is running (I tried this last night in the dark).

Thanks





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